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City Ditch piping project: trenchless boring finds high-iron groundwater; staff presents up-to-$375,939 change order for dewatering and treatment
Summary
Project manager Stephanie Ellis told the board that trenchless boring under Slaughterhouse Gulch found groundwater iron at about 21,000 micrograms per liter (regulatory standard 1,000 μg/L); remediation requires a CDPHE permit and staff presented a maximum change order of $375,939 within existing staff-managed contingency.
Project manager Stephanie Ellis updated the Water and Sewer Board on construction progress for Reaches 3 and 4 of the City Ditch piping project and informed the board of an unanticipated groundwater issue requiring remediation.
Ellis reported that the contractor (HEI Civil) has installed pipeline in Reach 4 and the majority of Reach 3; work included rerouting stormwater, adding access manholes, and restoring disturbed areas. In Reach 3 the team will use trenchless boring to pass under…
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